Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
Dec. 31, 2010	Sep. 30, 2012
Self-Insurance disclosures
Workers compensation claims		$ 2.0
Workers automobile claims		1.0
Mexico
Income tax contingencies
Assessed income tax amount of NDIL's Mexico branch		19.8
Unrecognized tax benefits reductions resulting from lapse of applicable statute of limitations	$ 7.4

Represents the amount of per-occurrence deductible which the entity has on its automobile insurance claims.

No definition available.

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- Details

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- Definition

Represents the amount of per-occurrence deductible which the entity has on its workers compensation insurance claims.

+ References

No definition available.

+ Details

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- Definition

The estimated loss resulting from the income tax examination that has been accrued as of the balance sheet date, including interest and penalties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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- Definition

The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 21

-Subparagraph a(4)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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